摘要
采用显微组织观察、硬度测试等手段研究了不同固溶、时效处理对Mg-5Al-0.3Mn-1Gd合金组织和硬度的影响。结果表明:铸态Mg-5Al-0.3Mn-1Gd合金经过430℃×2 h+565℃×4 h固溶后,合金中β-Mg_(17)Al_(12)相完全溶入基体,稀土相呈短棒状在Mg-5Al-0.3Mn-1Gd合金基体中弥散分布,合金晶粒没有明显长大。再对其进行230℃不同时间的时效处理,随着时效时间的增加,Mg-5Al-0.3Mn-1Gd合金中析出第二相数量逐渐增加,最终细小的第二相在局部富集,合金的硬度先增加后降低。Mg-5Al-0.3Mn-1Gd合金的最佳固溶时效工艺为430℃×2 h+565℃×4 h固溶+230℃×16 h时效。
The effects of different solution and aging treatments on the microstructure and hardness ofMg-5Al-0.3Mn-1Gd alloy were studied by means of microstructure observation and hardness test.The results show that after solution at 430℃×2 h+565℃×4 h,β-Mg_(17)Al_(12) phase in the as-cast Mg-5Al-0.3Mn-1Gd alloy is completely dissolved into the matrix,and the rare earth phase is dispersed in the matrix of Mg-5Al-0.3Mn-1Gd alloy in the shape of short rods,and the grain size of the alloy does not grow up significantly.After aging at 230℃for different time,with the increase of aging time,the number of second phase precipitated in Mg-5Al-0.3Mn-1Gd alloy gradually increases,and finally the fine second phase is concentrated in the local area,and the hardness of the alloy first increases and then decreases.The optimal solution and aging process for Mg-5Al-0.3Mn-1Gd alloy is 430℃×2 h+565℃×4 h solution+230℃×16 h aging.
作者
李成思
LI Chengsi(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430000,China;School of Mechanical Engineering,Henan Polytechnic Institute,Nanyang 473000,China)
出处
《热加工工艺》
北大核心
2024年第17期152-154,共3页
Hot Working Technology
基金
河南省科技发展计划项目(182102210266)。
